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A study of the subcultures of the Rawlins strain of Bacterium typhosum used by twelve different laboratories for vaccine production showed that they all differed from recently isolated smooth strains in cultural characteristics, virulence and protective efficiency. Eleven of these Rawlins cultures gave both the flagellar and the somatic type of… (More)
Serological analyses of the constitution of the motile bacilli have established the existence of a heat-labile agglutinogen associated with the flagellae and of a heat-stable agglutinogen contained in the bacil-lary bodies. Whereas there appears to be no antigenic difference in the flagellar substance of the smooth and the rough forms, the studies of the… (More)